Holesaw Adapter

[OnOff]

Say you have a 16mm hole but you want to put a 20 in or a 20mm hole and want a 25 hole. Yes, I know cone cutters / step drills etc but they go blunt. Starrett have the "OOPS" allowing holesaws of two different arbor sizes to be used but no good for the smaller sizes:



But for using two of the smaller sized arbor cutters together........I think I'll call mine the "FOOKIT". First, get yourself a 1/2" UNF 20tpi x 2 1/2" long bolt and cut the head off, file neatly and de-burr:



Then screw on a couple of Starretts:



Job done. Needs a 13mm chuck so I'm going to turn the plain shank down to 10mm so I can use in my right angle drill too.

 

[steptoe]

How much,?   :|

 

[OnOff]

How much,?   :|

About 60p for a bolt. High tensile ones these are.

 

[m4tty]

You "THE MAN" thats a pukka idea. Nice one

How much you selling them for

 

[Steve3948]

Generally I just drop the 20mm inside the 25mm, which is ok unless drilling down.

 

[NozSpark]

Thankfully my arbour just about has enough thread for 2 holesaws

 

[dave2]

I have a piece of 18mm chipboard with various holes already cut in.

If i need to enlarge a hole I just centre the required hole diameter  over the existing hole and drill away.

Works every time.

 

[kerching]

As Prof Heinz Wolffffffffe would have said...." A velly elegwant sowution to a twicky pwoblem, well done"

Just congratulating

 

[Sharpend]

Ah but he'd of suggested using an egg machine to turn the holesaw!

 

[Evans Electric]

Couple of good ideas there ...can I suggest they are duplicated in the Tricks of the Trade section .

 

[OnOff]

The Great Egg Race! I used to love that as a kid.

I went off of Scrapheap Challenge though when I got into model rocketry for a short bit and one of the lads had been on as a team expert. Reckons they gave him a made up nickname to spice things up and the teams got extra time when the builds didn't work properly. Used to like that Lisa Rogers bird though..........

 

[kerching]

Yea indeed , Lisa Rogers Mmmmmmmmm

Great Egg race went downhill when they took the EGG out of it though

Secret Life of Machines was another good series

And the "Great Inventor" series of build it yourself models were tops, I had them all

 

[kerching]

How about this for the mkII version?

Run a nut to the end of the thread and 'tack' it on. That way you have something to grip in case the outer saw blade tightens up onto the unthreaded portion, that way you won't trash the shank

Just a thought

 

[OnOff]

Holy Thread Resurrection Batman!

Needs must and all that the "FOOKIT+":

Take one 5/8"-18 UNF bolt. Black would have been better but they gave me BZP and plain nuts:





Stick 3 nuts on and bung it in the lathe. Roughly turn down the head end to 10mm dia x 25mm long. Drill and pin the nut onto the shaft:





Screw on a big "Starrett":





Screw on the small Starrett:





Pack between the two with M16 washers if you want the smaller one to project more:





Best go and use it for the job I need it for now!

 

[kerching]

I made a couple of these after your first post.....    @Sidewinder or @Canoeboy sent me some bolts

i like the mkII version with the pinned nut

much more solid than the 'ooops'

 

[Andy™]

so what did you drill the wrong size hole in?

 

[kerching]

so what did you drill the wrong size hole in?

Maybe not his fault!

my mates son is a 'spark, and I use the word 'spark' in entirely the wrong way

he helped by drilling all the down light holes with a 56mm hole saw .........W️

So a fookit MKI had to be made.....then I realised my "Ooops " would have done it

FOOOKIT is better and more satisfying 

 

[OnOff]

so what did you drill the wrong size hole in?

Not a mistake as such.....

Running a new water main into the house up through the footings and into the suspended floor. First I drilled down thru the floor boards with a 50mm Starrett. I then drilled at a slight angle with a 1m long 24mm followed by a 32mm SDS bit. To protect the 25mm MDPE pipe within the suspended floor space from the tunnel bunnies I sleeved it with an off cut of 2" x 1/4" wall stainless.







BUT I then realised I should have run the pipe in an insulated sleeve because of the freezing risk within the suspended floor space.

So the FECKIT+ was to neatly open up the 50mm hole to 70mm.....which worked a treat:





This was just to get a 65mm core cutter in. I've had to split the core cutter and put an extension bar in o/of a bit of M16 stud. The business end I've drilled and tapped a bit of 32mm solid bar that goes into the existing hole through the footings:








Slow going so gave up tonight as it was approaching beer o'clock!

 

[kerching]

Another elegant solution to a twicky pwoblem ( Prof H Wolffe) :Salute

 

[OnOff]

Another elegant solution to a twicky pwoblem ( Prof H Wolffe) :Salute

Fingers crossed I'll get the Lisa Rogers Nighttime Visitation Award!